Sandal upper



FIG. 1 is a to perspective view of a sandal upper, showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a front elevational view thereof; and,

FIG. 6 is a rear elevational view thereof.

The broken line showing a s sole in FIGS. 1-6 is for illustrative purposes only and forms no part of claimed design. 

The ornamental design for a sandal upper, as shown and described. 